关键词: 土壤含水量, 下垫面条件, 动态变化规律, 徐州南部郊区

Abstract: Soil water is an important component of the hydrologic cycle. Researching on soil moisture of different underlying surfaces is important in guiding regional crop configuration and the layout and rational utilization of land resources. Taking southern suburbs of Xuzhou City as the research object, we choose different types of underlying surfaces, pear orchard, cauliflower belt, young soybean belt, sandy land and wasteland to measure the soil water content at different soil depths (0~100cm). The dynamic change of soil water was statistically analyzed in term of profile and time series respectively. It is concluded that similarity and difference are existed in the dynamic variation pattern of soil water in different underlying surfaces. The results show that soil moisture in profile could be divided into four layers: vertiginous layer (0 ~ 20 cm), active layer (20 ~ 40 cm), transfer layer (40 ~ 70 cm) and stable layer (70 ~ 100 cm). The depth of plant root system affects the vertical distribution of soil moisture in the same type of soil; The autumn harvest and precipitation are important factors affecting time series of soil moisture.

Key words: soil water content, underlying surfaces condition, dynamic variation rule, southern suburb of Xuzhou City